GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Power Sunroof System Check ?

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Go to Step 2

Go to Power Sunroof System Check

2

  1. Close the sunroof. Use the following method if necessary.
  2. 1.1. Partially lower the headliner.
    1.2. Locate the slot in the track transmission.
    1.3. Using a flat-bladed screwdriver, apply upward pressure to release the clutch and manually turn the transmission.
  3. Turn the ignition switch to OFF.
  4. Disconnect the sunroof control module connectors C1 and C2.
  5. Connect a J 39200 digital multimeter (DMM) set to ohms scale across connector C2 terminals 1and 8.

Is the measured resistance in the specified range?

Less than 5ohms

Go to Step 3

Go to Step 6

3

  1. Connect a DMM set to ohms scale across connector C2 terminals 5 and 7.
  2. Push the sunroof switch up, then down.

Is the measured resistance in the specified range when the switch is pressed up and when the switch is pressed down?

Less than 5ohms

Go to Step 4

Go to Step 5

4

Replace the sunroof control module. Refer to Power Sunroof Express Module Replacement . Is the repair complete?

--

Go to Step 7

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5

Replace the sunroof switch. Refer to Sunroof Switch Replacement .

Is the repair complete?

--

Go to Step 7

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6

Replace the sunroof actuator. Refer to Power Sunroof Motor Replacement .

Is the replacement complete?

--

Go to Step 7

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7

  1. Make sure any components removed during diagnosis are installed in place and that all connectors are connected.
  2. Repeat the system check. Refer to Power Sunroof System Check .

Is the system check complete?

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System OK

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